gistfile1.sh

#!/bin/bash

echo Waiting for NTP sync status
start_time=$(cut -f1 -d. /proc/uptime)
delta=0
while ntptime | grep UNSYNC ; do
  now=$(cut -f1 -d. /proc/uptime)
  delta=$[$now - $start_time]
  if [ $delta -gt 600 ]; then
    echo NTP time sync never achieved. Failing build.
    exit 1
  fi
  echo NTP not yet synchronized after $delta secs... sleeping
  sleep 5
done

echo NTP synchronized after $delta seconds